feat(Webhook): add 'fetchMessage' method (#5530)

src/structures/Webhook.js

@@ -236,6 +236,18 @@ class Webhook {
     return this;
   }
 
+  /**
+   * Gets a message that was sent by this webhook.
+   * @param {Snowflake} message The ID of the message to fetch
+   * @param {boolean} [cache=true] Whether to cache the message
+   * @returns {Promise<Message|Object>} Returns the raw message data if the webhook was instantiated as a
+   * {@link WebhookClient} or if the channel is uncached, otherwise a {@link Message} will be returned
+   */
+  async fetchMessage(message, cache = true) {
+    const data = await this.client.api.webhooks(this.id, this.token).messages(message).get();
+    return this.client.channels?.cache.get(data.channel_id)?.messages.add(data, cache) ?? data;
+  }
+
   /**
    * Edits a message that was sent by this webhook.
    * @param {MessageResolvable} message The message to edit
@@ -326,6 +338,7 @@ class Webhook {
     for (const prop of [
       'send',
       'sendSlackMessage',
+      'fetchMessage',
       'edit',
       'editMessage',
       'delete',

typings/index.d.ts

@@ -1819,6 +1819,7 @@ declare module 'discord.js' {
       options?: WebhookEditMessageOptions,
     ): Promise<RawMessage>;
     public editMessage(message: MessageResolvable, options: WebhookEditMessageOptions): Promise<RawMessage>;
+    public fetchMessage(message: Snowflake, cache?: boolean): Promise<RawMessage>;
     public send(
       content: APIMessageContentResolvable | (WebhookMessageOptions & { split?: false }) | MessageAdditions,
     ): Promise<RawMessage>;
@@ -2166,6 +2167,7 @@ declare module 'discord.js' {
       options?: WebhookEditMessageOptions,
     ): Promise<Message | RawMessage>;
     editMessage(message: MessageResolvable, options: WebhookEditMessageOptions): Promise<Message | RawMessage>;
+    fetchMessage(message: Snowflake, cache?: boolean): Promise<Message | RawMessage>;
     send(
       content: APIMessageContentResolvable | (WebhookMessageOptions & { split?: false }) | MessageAdditions,
     ): Promise<Message | RawMessage>;